Peter David helped define the Matrix Supergirl, but even when DC was done with the character, he continued to tell her stories at a different company.
NO ONE CAN BE TOLD WHO MATRIX IS – Roger Stern and the Unsung Supergirl
Peter David's Fallen Angel Was Supergirl In Everything But Name
DC Comics - Fallen Angel 1-4, 13-20 and Shade the Changing Man PICK YOUR ISSUES
Peter David's Fallen Angel Was Supergirl In Everything But Name
The Superman Super Site - Supergirl
What is your favorite Peter David story in both Marvel Comics and DC Comics, and why? - Quora
DC History Club: Impact Writers, Peter David's Aquaman, Supergirl & Young Justice Discussion, Polls, Quiz - Fan Club Discussions - DC Community
Supergirl (Kara Zor-El) - Wikipedia
Supergirl (1996) (Comic Book) - TV Tropes
